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Puranjay Mohan says: ==================== bpf: Nested rcu critical sections v1: https://lore.kernel.org/bpf/20250916113622.19540-1-puranjay@kernel.org/ Changes in v1->v2: - Move the addition of new tests to a separate patch (Alexei) - Avoid incrementing active_rcu_locks at two places (Eduard) Support nested rcu critical sections by making the boolean flag active_rcu_lock a counter and use it to manage rcu critical section state. bpf_rcu_read_lock() increments this counter and bpf_rcu_read_unlock() decrements it, MEM_RCU -> PTR_UNTRUSTED transition happens when active_rcu_locks drops to 0. ==================== Link: https://patch.msgid.link/20251117200411.25563-1-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.